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Line 85: Line 85:
                 with open(sys.argv[1] + '.bin', 'wb') as g:
                 with open(sys.argv[1] + '.bin', 'wb') as g:
                     g.write(hdr+body)
                     g.write(hdr+body)
           
           
if __name__ == '__main__':
    main(len(sys.argv), sys.argv)
</pre>
= Python Script to Encrypt (Requires Header from Decryption Script) =
<pre>
import struct
from binascii import unhexlify as uhx
from binascii import hexlify as hx
from Crypto.Cipher import AES
from Crypto.Hash import SHA, HMAC
import os
import sys
CIPHERKEYSEMC = ['F0332357C8CFAE7E7E26E52BE9E3AED4']
CIPHERKEYSEAP = ['262555E3CF062B070B5AA2CDDF3A5D0E']
HASHERKEYEMC  = ['00000000000000000000000000000000']
HASHERKEYEAP  = ['1EE22F6A189E7D99A28B9A96D3C4DBA2']
ZEROS128 =      ['00000000000000000000000000000000']
def aes_decrypt_cbc(key, iv, input):
    return AES.new(key, AES.MODE_CBC, iv).decrypt(input)
   
def aes_encrypt_cbc(key, iv, input):
    return AES.new(key, AES.MODE_CBC, iv).encrypt(input)
def emc_decrypt_header(hdr):
    return hdr[:0x30] + aes_decrypt_cbc(uhx(CIPHERKEYSEMC[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
   
def emc_encrypt_header(hdr):
    return hdr[:0x30] + aes_encrypt_cbc(uhx(CIPHERKEYSEMC[0]), uhx(ZEROS128[0]), hdr[0x30:])
   
def eap_decrypt_header(hdr):
    return hdr[:0x30] + aes_decrypt_cbc(uhx(CIPHERKEYSEAP[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
   
def eap_encrypt_header(hdr):
    return hdr[:0x30] + aes_encrypt_cbc(uhx(CIPHERKEYSEAP[0]), uhx(ZEROS128[0]), hdr[0x30:0x80])
def main(argc, argv):
        with open(sys.argv[1], 'rb') as f:
            data = f.read()
            type = data[7:8]
            if type == uhx('48'):
                print 'EMC'
               
                body_len = struct.unpack('<L', data[0xc:0x10])[0]
                body = data[0x80:0x80+body_len]
                body_aes_key  = data[0x30:0x40]
                ebody = aes_encrypt_cbc(body_aes_key, uhx(ZEROS128[0]), body)
                body_hmac_key = data[0x40:0x50]
                bhmac = HMAC.new(body_hmac_key, ebody, SHA)
                hdr = (data[0:0x50] + uhx(bhmac.hexdigest()) + data[0x64:0x6C])
                hhmac = HMAC.new(uhx(HASHERKEYEMC[0]), hdr, SHA)
                hdr = (hdr + uhx(hhmac.hexdigest()))
                hdr = emc_encrypt_header(hdr)
                print bhmac.hexdigest()
                print hhmac.hexdigest()
                with open(sys.argv[1] + '.bin', 'wb') as g:
                    g.write(hdr+ebody)
            if type == uhx('68'):
                print 'EAP'
                body_len = struct.unpack('<L', data[0xc:0x10])[0]
                body = data[0x80:0x80+body_len]
                body_aes_key  = data[0x30:0x40]
                ebody = aes_encrypt_cbc(body_aes_key, uhx(ZEROS128[0]), body)
                body_hmac_key = data[0x40:0x50]
                bhmac = HMAC.new(body_hmac_key, ebody, SHA)
                hdr = (data[0:0x50] + uhx(bhmac.hexdigest()) + data[0x64:0x6C])
                hhmac = HMAC.new(uhx(HASHERKEYEAP[0]), hdr, SHA)
                hdr = (hdr + uhx(hhmac.hexdigest()))
                hdr = eap_encrypt_header(hdr)
                print bhmac.hexdigest()
                print hhmac.hexdigest()
                with open(sys.argv[1] + '.bin', 'wb') as g:
                    g.write(hdr+ebody)
              
              
              
              
Line 356: Line 276:
EXPECTED_VERSION = 0x10000
EXPECTED_VERSION = 0x10000
PARTITION_SIZE = 16 * 1024 * 1024
PARTITION_SIZE = 16 * 1024 * 1024
#BLOB_MAGIC = 0x464C457F
BLOB_MAGIC = 0x4B726E00
BLOB_MAGIC = 0x4B726E00
SECTOR_SIZE = 0x200
SECTOR_SIZE = 0x200
Line 449: Line 370:
         f.seek(PARTITION_SIZE)
         f.seek(PARTITION_SIZE)
         f.truncate()
         f.truncate()
</pre>
= Python script to decrypt env.img =
<pre>
import sys
import struct
def unscramble(data):
    data_size = len(data)
    num_dwords = data_size // 4
    magic = 0x012BB055 # TODO: constant from header @ 0xC
    new_data = bytearray()
    for i in range(num_dwords):
        value = struct.unpack_from('<I', data, i * 4)[0]
        value, magic = value ^ magic, value
        new_data += struct.pack('<I', value)
    return new_data
   
with open(sys.argv[1],"rb") as file:
    file.seek(0x40)
    data=file.read(0xFF80)
    new_data = unscramble(data)
    with open(sys.argv[2],"wb") as file2:
        file2.write(new_data)
</pre>
</pre>


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